$\sec\left(a\right)\csc\left(a\right)-\cot\left(a\right)=\tan\left(a\right)$
$x^4+2x^2-12$
$\left(5^3\right)^3$
$\frac{x^3+8x^2-7}{x-1}$
$5\sqrt{2}-7\sqrt{2}=-2\sqrt{2}$
$y=4\ln\left(x+5\right)$
$\left(7a+2\right)\left(7ax-6\right)$
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